(72k, 482x747) Country: United States City: New York System: New York City Transit Location: IRT Substation 21 Photo by: David M. Rosenthal Date: 10/22/1996 Notes: Sychroscope for synchronizing rotary converter. When a rotary converter is brought up to speed by the third rail, then the sychroscope and associated sychronizing lights are used to determine when rotary converter is in step or sychronized with the incoming AC power feeds. At that time, the rotary converter is disconnected from the third rail and the AC power feeders at connected to run the rotary converter. Viewed (this week/total): 1 / 13294 |
Available Image EXIF Data: Resolution : 482 x 747 |